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|  MIL-C-18087A(SH)
TABLE I. Materials of principal parts - continued.
Hardness is minimum.
BHN is standard Brinell hardness number. Rc is hardness designated in
Rockwell C scale.
Carburizing steels, when case hardened, shall have a minimum case depth
of 0.025 inch; tooth and splines shall have a case depth (see 6.8.4) of
0.025 inch or 10 percent of the tooth chordal thickness whichever is
greater. Tooth and spline surfaces shall have a minimum surface hardness
of 56 Rockwell C, other surfaces as specified by the contractor and
approved by the contracting activity.
Nitriding steels, when case hardened, shall have a minimum case depth
(see 6.8.4) of 0.020 inch; teeth and spline surfaces shall have a minimum
surface hardness of 49 Rockwell C, other surfaces as specified by the
contractor and approved by the contracting activity.
Through-hardened parts shall have a surface hardness as specified by the
contractor and approved by the contracting activity.
Aluminum alloy parts for salt water service shall be of a high-corrosion
resistant alloy.
See 3.4.13.
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